Dallas Mavericks lose NBA champion assistant coach to Warriors

The Dallas Mavericks are set to lose a championship-winning assistant coach to their Western Conference rivals, the Golden State Warriors. The move comes after Dallas opened the 2026 season with two straight wins, including a 149-128 blowout over the Chicago Bulls on April 13.

What happened?

The Mavericks confirmed the departure of an unnamed assistant coach who helped guide the franchise to its first NBA title last season. The coach has agreed to join the Warriors’ staff, according to league sources. The news broke as Dallas stood at 2-0 in the 2026 campaign, with their recent form reading 2 wins, 0 losses, 3 defeats (WWLLL) over the last five games.

Why it matters for Dallas Mavericks

Losing a championship-winning assistant hurts the Mavericks’ continuity. The coach’s experience in playoff schemes and late-game execution was a key factor in their postseason run. Dallas now faces a coaching staff reshuffle as they aim to defend their title. Their next challenge comes after a strong start, but the loss of institutional knowledge could slow their momentum.

What comes next?

The Mavericks must replace the departing assistant quickly. With a 2-0 record, they’re off to a fast start, but the Warriors’ gain is Dallas’ loss. The move also shifts the balance in the West as both teams eye another deep playoff push. The Mavericks’ next game is set for July 16, when they face the Sacramento Kings in their third outing of the season.